How can I create Enemy CCTV?

Can you see there are CCTV with point of sight blockable? How can I create it? All I can do is “see through wall” using collision mesh…

I want to create similar to metal gear solid gameplay. Heh.

Line traces. If your game is flat then just do horizontal trace from camera in some redius and cone.

Now painting that cone of visibility would be totally different can of worms.